How do scanning electron microscopes differ from transmission microscopes

The accelerating voltages are much lower than in TEM because it is no longer necessary to penetrate the specimen; in a SEM they range from 50 to 30,000 volts;

as well as rather than the broad static beam used in TEM, the SEM beam is focused to a fine point and scans line by line over the sample surface in a rectangular raster pattern

3. is true i think i should be right

Hello there,before the 1940s, scientists believed that proteins, rather than dna, were the carriers of genetic material in the cell. why?   answer:   proteins are present within the nucleus